توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: دهمین کنگره ملی مهندسی شیمی ایران، سال ۱۳۸۴
تعداد صفحات: ۱۰
A method of supporting TiO2 on zeolite, without losing the photosensitization of TiO2 and the adsorption properties of zeolite, is the important aspect while preparing zeolite–based photocatalysts. Titanium(IV) oxide with different amount was supported on HZSM–5 zeolite using solid state dispersion (SSD) method. The photocatalytic activity of these systems in the degradation of acid red 114 indicates that TiO2\HZSM–5 (SSD) is an active photocatalyst; the optimum photodegradation activity is seen at 10–15 wt.% TiO2\HZSM–5.Based on these results, a model highlighting the photodegradation activity of immobilized [TiO2\HZSM–5 (SSD)] TiO2, which may lead to the development of an easy and effective technology in wastewater treatments, is proposed.<\div>
۲The Effect of Alkali Metal Promoters on the Stability and Coke Formation of Platinum–Based Propane Dehydrogenation Catalysts: A Kinetic Study
اطلاعات انتشار: Iranian Journal of Chemistry and Chemical Engineering (IJCCE)، سي و دوم،شماره۴(پياپي ۶۸)، ۲۰۱۳، سال ۰
تعداد صفحات: ۸
The kinetics of catalyst deactivation and coke formation during dehydrogenation of propane over supported Pt–based catalysts and, in particular, the effect of alkali metal promoters on catalyst activity and stability were studied. The analysis of propane conversion data showed that there is an optimum level of alkali metal promoter loading for both catalyst activity and stability.A model based on individual site poisoning was proposed for coke deposition kinetics. The model showed fair fits for coke formation data with time on stream. While the rate constant of coke formation was slightly affected by loading of Na as the neutralizing promoter, the ultimate coke amount was strongly dependent on the Na loading. It was found that coke formation sites should be different from active sites for the main reaction.
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